Mike Garrahan
@mgarraha.bsky.social
Amateur classical musician and astronomer. Advocate for year-round standard time.
These are reasonable questions, and Roenneberg et al. cover most of them in this 2019 review paper.
Frontiers | Daylight Saving Time and Artificial Time Zones – A Battle Between Biological and Social Times
Many regions and countries are reconsidering their use of Daylight Saving Time (DST) but their approaches differ. Some, like Japan, that have not used DST ov...
www.frontiersin.org
December 21, 2025 at 10:45 PM
These are reasonable questions, and Roenneberg et al. cover most of them in this 2019 review paper.
GMT is the mean solar time of Greenwich by definition. Paris mean time (PMT?) is only 9½ minutes ahead of that.
Human activity naturally tends to lag behind the Sun. DST, born of a wish that it didn't, has chronic harmful effects in addition to the obvious acute ones.
Human activity naturally tends to lag behind the Sun. DST, born of a wish that it didn't, has chronic harmful effects in addition to the obvious acute ones.
December 21, 2025 at 10:36 PM
GMT is the mean solar time of Greenwich by definition. Paris mean time (PMT?) is only 9½ minutes ahead of that.
Human activity naturally tends to lag behind the Sun. DST, born of a wish that it didn't, has chronic harmful effects in addition to the obvious acute ones.
Human activity naturally tends to lag behind the Sun. DST, born of a wish that it didn't, has chronic harmful effects in addition to the obvious acute ones.
Local mean time there is 16 minutes ahead of EST and 44 minutes behind AST. Eastern is the correct zone for that location.
December 21, 2025 at 9:10 PM
Local mean time there is 16 minutes ahead of EST and 44 minutes behind AST. Eastern is the correct zone for that location.
The Eastern/Atlantic zone boundary is already in the right place, near 67.5°W.
December 21, 2025 at 8:14 PM
The Eastern/Atlantic zone boundary is already in the right place, near 67.5°W.
Reposted by Mike Garrahan
21. And before team Yglesias responds by saying "yeah, but it's bad politics to run on climate and energy"... I'd point out that I've won 4 elections in a very purple district running on climate and energy. Pro-tip: leadership is possible! You don't have to be stupid to win!
December 20, 2025 at 4:12 PM
21. And before team Yglesias responds by saying "yeah, but it's bad politics to run on climate and energy"... I'd point out that I've won 4 elections in a very purple district running on climate and energy. Pro-tip: leadership is possible! You don't have to be stupid to win!
US farmers demanded the repeal of DST in 1919 and opposed bringing it back to rural areas until 1966.
December 20, 2025 at 11:46 PM
US farmers demanded the repeal of DST in 1919 and opposed bringing it back to rural areas until 1966.
DST originated as an early bird's attempt to push night owls into such a pattern. Standard time, by not tilting the clock, gives us a better chance to benefit from morning light and establish a healthy circadian rhythm.
www.frontiersin.org/journals/phy...
www.frontiersin.org/journals/phy...
Frontiers | Daylight Saving Time and Artificial Time Zones – A Battle Between Biological and Social Times
Many regions and countries are reconsidering their use of Daylight Saving Time (DST) but their approaches differ. Some, like Japan, that have not used DST ov...
www.frontiersin.org
December 20, 2025 at 1:18 AM
DST originated as an early bird's attempt to push night owls into such a pattern. Standard time, by not tilting the clock, gives us a better chance to benefit from morning light and establish a healthy circadian rhythm.
www.frontiersin.org/journals/phy...
www.frontiersin.org/journals/phy...
That would be a result of year-round DST as others have proposed. @savestandard.bsky.social advocates for continuing to observe standard time in winter and also in summer.
December 19, 2025 at 10:59 PM
That would be a result of year-round DST as others have proposed. @savestandard.bsky.social advocates for continuing to observe standard time in winter and also in summer.
The best way to prevent that shock is to remain on standard time in the spring. Perma-DST would unsafely darken winter mornings as in 1974.
December 15, 2025 at 5:54 PM
The best way to prevent that shock is to remain on standard time in the spring. Perma-DST would unsafely darken winter mornings as in 1974.
It is not dark at 3:30 anywhere in the contiguous 48 states.
December 15, 2025 at 4:51 PM
It is not dark at 3:30 anywhere in the contiguous 48 states.
The AM daylight is not extra, only half of the naturally limited total.
December 15, 2025 at 3:55 PM
The AM daylight is not extra, only half of the naturally limited total.
75°W is where mean solar time matches EST - a basis, not a boundary. Atlantic time is for places closer to 60°W.
December 10, 2025 at 9:43 PM
75°W is where mean solar time matches EST - a basis, not a boundary. Atlantic time is for places closer to 60°W.
Reposted by Mike Garrahan
People really do not understand how awful for your health it is to routinely wake up in the dark.
December 10, 2025 at 7:49 AM
People really do not understand how awful for your health it is to routinely wake up in the dark.
The county road to Hell MI is paved.
maps.app.goo.gl/QMzKQzPCQ7si...
maps.app.goo.gl/QMzKQzPCQ7si...
December 9, 2025 at 5:00 PM
The county road to Hell MI is paved.
maps.app.goo.gl/QMzKQzPCQ7si...
maps.app.goo.gl/QMzKQzPCQ7si...
The Englishman who started pushing it in 1907 thought his later-rising neighbors were "wasting" summer morning daylight. In winter we don't and shouldn't observe DST.
December 9, 2025 at 3:10 PM
The Englishman who started pushing it in 1907 thought his later-rising neighbors were "wasting" summer morning daylight. In winter we don't and shouldn't observe DST.
Back then, they were trying to save energy under a foreign oil embargo. Today, decades of clock changes have conditioned people to undervalue AM light and overvalue PM light.
December 9, 2025 at 2:46 PM
Back then, they were trying to save energy under a foreign oil embargo. Today, decades of clock changes have conditioned people to undervalue AM light and overvalue PM light.
That was an attempt to observe DST year round. Standard time does not darken winter mornings.
December 8, 2025 at 5:51 PM
That was an attempt to observe DST year round. Standard time does not darken winter mornings.
Indiana observes DST statewide since 2006.
December 7, 2025 at 4:21 PM
Indiana observes DST statewide since 2006.
What they tried in 1974 was year-round DST. Standard time doesn't darken mornings.
December 7, 2025 at 4:20 PM
What they tried in 1974 was year-round DST. Standard time doesn't darken mornings.
The Allstate ad where the old wiring catches fire?
December 4, 2025 at 9:11 PM
The Allstate ad where the old wiring catches fire?